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Table 12 Potential instances that could lead to inferring patient information

From: Development and evaluation of a de-identification procedure for a case register sourced from mental health electronic records

Patient Type of PI Year of document Number of sequential records read to obtain this information Reason for appearance on CRIS Confidence in re-identification
2 Patient prison reference number 2012 12 No rule to de-identify prison reference numbers or prison contact information Low: cannot be verified, and misspellings [22]
Prison contact phone number    Typographical error in patient’s last name  
Patient last name